JP5451934B1 - Manufacturing method of laminated iron core - Google Patents
Manufacturing method of laminated iron core Download PDFInfo
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- JP5451934B1 JP5451934B1 JP2013161703A JP2013161703A JP5451934B1 JP 5451934 B1 JP5451934 B1 JP 5451934B1 JP 2013161703 A JP2013161703 A JP 2013161703A JP 2013161703 A JP2013161703 A JP 2013161703A JP 5451934 B1 JP5451934 B1 JP 5451934B1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000011347 resin Substances 0.000 claims abstract description 149
- 229920005989 resin Polymers 0.000 claims abstract description 149
- 238000002347 injection Methods 0.000 claims abstract description 58
- 239000007924 injection Substances 0.000 claims abstract description 58
- 238000003780 insertion Methods 0.000 claims abstract description 34
- 230000037431 insertion Effects 0.000 claims abstract description 34
- 238000003825 pressing Methods 0.000 claims abstract description 33
- 238000010030 laminating Methods 0.000 claims abstract description 10
- 239000004071 soot Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 12
- 238000007789 sealing Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
【課題】樹脂注入用金型又は中間プレートと、積層鉄心本体との間に生じる隙間を樹脂漏れが生じる厚みより小さくして、樹脂滓が少なく、更に磁石挿入孔への樹脂未充填が生じ難い積層鉄心の製造方法を提供する。
【解決手段】複数枚の鉄心片１１、１２をかしめ積層して形成され、複数の磁石挿入孔１７、１８には永久磁石２０が挿入された積層鉄心本体１０を、対向する樹脂注入用金型２３と受け金型２２とで挟持した状態で、樹脂注入用金型２３に設けられた樹脂溜め部から磁石挿入孔１７、１８に樹脂を注入して永久磁石２０を固定する積層鉄心の製造方法において、樹脂注入の際、樹脂注入用金型２３の押圧平面２４を積層鉄心本体１０の表面より突出するかしめ部１３に押し当てて加圧し、かしめ部１３が形成された積層鉄心本体１０の表面を押圧平面２４に押し付けて、樹脂漏れを防止する。
【選択図】図１A gap between a resin injection mold or intermediate plate and a laminated core body is made smaller than a thickness at which resin leakage occurs, so that there is less resin soot, and resin unfilled into a magnet insertion hole is difficult to occur. A method for producing a laminated core is provided.
A resin-injecting mold is formed by opposing a laminated core body 10 formed by caulking and laminating a plurality of iron core pieces 11 and 12 and having permanent magnets 20 inserted into a plurality of magnet insertion holes 17 and 18. 23. A method of manufacturing a laminated iron core in which a permanent magnet 20 is fixed by injecting resin into the magnet insertion holes 17 and 18 from a resin reservoir provided in the resin injection mold 23 in a state of being sandwiched between the core 23 and the receiving mold 22 2, when the resin is injected, the pressing surface 24 of the resin injection mold 23 is pressed against the caulking portion 13 protruding from the surface of the laminated core body 10 to pressurize the surface, and the surface of the laminated core body 10 on which the caulking portion 13 is formed. Is pressed against the pressing plane 24 to prevent resin leakage.
[Selection] Figure 1
Description
本発明は、磁石挿入孔内に挿入された永久磁石を樹脂封止する場合に、樹脂の漏出を極力防止した積層鉄心（例えば、インナーロータコア及びアウターロータコアをいう）の製造方法に関する。 The present invention relates to a method of manufacturing a laminated core (for example, an inner rotor core and an outer rotor core) in which leakage of resin is prevented as much as possible when a permanent magnet inserted into a magnet insertion hole is sealed with resin.
従来、モータに使用する積層鉄心は、複数の鉄心片を積層して円周方向に複数の磁石挿入孔を有する積層鉄心本体（コア）を造り、各磁石挿入孔に永久磁石を挿入した後、樹脂注入用金型と受け金型との間に入れて積層方向に加圧し、樹脂注入用金型に設けられた樹脂溜めポットから樹脂を磁石挿入孔に入れて、樹脂封止することが行われていた（特許文献１参照）。
なお、特許文献１には、樹脂注入用金型が積層鉄心本体に当接する場合、積層鉄心本体から突出するかしめ突起（通称、かしめダボ）を収納する収納部を樹脂注入用金型に形成して、樹脂注入用金型と積層鉄心本体との間で樹脂漏れが生じないようにしている。
Conventionally, a laminated core used in a motor is made by laminating a plurality of core pieces to form a laminated core body (core) having a plurality of magnet insertion holes in the circumferential direction, and inserting a permanent magnet into each magnet insertion hole. It is inserted between the resin injection mold and the receiving mold and pressurized in the stacking direction, and the resin is put into the magnet insertion hole from the resin reservoir pot provided in the resin injection mold and sealed with resin. (See Patent Document 1).
In Patent Document 1, when the resin injection mold abuts against the laminated core body, a housing portion for accommodating a caulking protrusion (commonly called caulking dowel) protruding from the laminated core body is formed in the resin injection mold. Thus, no resin leakage occurs between the resin injection mold and the laminated core body.
また、図８に示すように、樹脂封止の際に、積層鉄心本体表面に樹脂が残留するのを防ぐために、樹脂注入用金型である上型６０と積層鉄心本体６１との間に、磁石挿入孔６２と樹脂溜めポット６３を連結するゲート孔６５が設けられた中間プレート６６（ダミープレート、カルプレート、トレイと称される）を配置し、ゲート孔６５から磁石挿入孔６２に樹脂を注入した後、中間プレート６６を余分な樹脂ごと積層鉄心本体６１から取り外す方法が提案されている（特許文献２参照）。
この中間プレート６６には、積層鉄心本体６１の表面から突出するかしめ突起６７を逃がす収納部６８が形成されている。なお、６９は下型（受け金型）を示す。
Also, as shown in FIG. 8, during resin sealing, in order to prevent the resin from remaining on the surface of the laminated core body, between the upper mold 60 that is a resin injection mold and the laminated core body 61, An intermediate plate 66 (referred to as a dummy plate, a cull plate, or a tray) provided with a gate hole 65 for connecting the magnet insertion hole 62 and the resin reservoir pot 63 is disposed, and resin is transferred from the gate hole 65 to the magnet insertion hole 62. After the injection, a method of removing the intermediate plate 66 from the laminated core body 61 together with the excess resin has been proposed (see Patent Document 2).
The intermediate plate 66 is formed with a storage portion 68 through which a caulking protrusion 67 protruding from the surface of the laminated core body 61 is released. Reference numeral 69 denotes a lower mold (receiving mold).
しかしながら、積層鉄心本体に使用される鉄心片の原材料となる薄板の磁性鋼板は、圧延して製造されるので、その製造工法上、均一な平面とはなっておらず、表面にはわずかながら凹凸状の変形や厚み偏差による傾きが残っている。特に、近年ではモータ性能の向上を図る目的から磁性鋼板の低鉄損化が進む中、従来に無かった現象として磁性鋼板の表面のうねりの発生が顕著である。更に、鉄心片を形成するためのプレス加工工程による打ち抜き時、及びかしめ積層時にコア表面を変形させる応力が加わるために、完成した積層鉄心本体には大小のうねりが生じている。 However, the thin magnetic steel plate used as the raw material for the core pieces used in the laminated core body is manufactured by rolling, so its manufacturing method does not provide a uniform flat surface, and the surface is slightly uneven. Inclination due to deformation and thickness deviation remains. In particular, in recent years, as the iron loss of magnetic steel sheets has been reduced for the purpose of improving motor performance, the occurrence of undulations on the surface of magnetic steel sheets is remarkable as an unprecedented phenomenon. Furthermore, since a stress that deforms the core surface is applied at the time of punching by a pressing process for forming the iron core piece and at the time of caulking and laminating, large and small undulations are generated in the completed laminated core body.
その結果、特に各鉄心片に発生したうねりが大きい所では、特許文献１に記載のように、収納部でかしめ突起を収納しても、又は特許文献１、２を組み合わせて中間プレートに積層鉄心本体に形成されたかしめ突起を収納する収納部を設けたとしても、樹脂注入用金型又は中間プレート表面と積層鉄心本体との間に生じる隙間を無くす、又は樹脂が漏れない程度まで隙間を微小にすることはできず、結局は樹脂封止時に隙間からの樹脂漏れが発生し、磁石挿入孔への樹脂の未注入が発生していた。 As a result, particularly in places where the waviness generated in each iron core piece is large, as described in Patent Literature 1, even if the caulking projection is accommodated in the accommodating portion, or in combination with Patent Literatures 1 and 2, the laminated iron core is placed on the intermediate plate. Even if a storage part is provided to store the caulking protrusions formed on the main body, the gap between the mold for resin injection or intermediate plate and the laminated core body is eliminated, or the gap is so small that the resin does not leak. In the end, resin leakage from the gap occurred during resin sealing, and no resin was injected into the magnet insertion hole.
この様子を、図９に示すが、黒い部分は樹脂注入用金型と積層鉄心本体との間に配置した感圧紙の感圧領域７０を示し、白い部分は感圧紙の非感圧領域７１を示す。なお、非感圧領域７１が磁石挿入孔７３に接している場合は隙間部分から樹脂漏れが発生する。樹脂漏れの箇所及び方向を図９にＲ１〜Ｒ４で示す。ここで、７２は軸孔を、７４は重量軽減用の抜き孔を、７５はかしめ突起の収納部を示す。 This state is shown in FIG. 9, where the black portion shows the pressure-sensitive area 70 of the pressure-sensitive paper disposed between the resin injection mold and the laminated core body, and the white portion shows the non-pressure-sensitive area 71 of the pressure-sensitive paper. Show. Note that when the non-pressure-sensitive region 71 is in contact with the magnet insertion hole 73, resin leakage occurs from the gap portion. The locations and directions of resin leakage are indicated by R1 to R4 in FIG. Here, 72 is a shaft hole, 74 is a weight reducing hole, and 75 is a caulking projection accommodating portion.
また、従来は樹脂注入用金型又は中間プレートと積層鉄心本体との間に目視して一定値以上の隙間を有する場合、隙間からの樹脂漏れが発生する可能性が極めて高く、廃棄処理していたので、積層鉄心本体の歩留りが低下する原因となっていた。
本発明者は、うねりを有する鉄心片を用いて積層鉄心本体が形成された場合に、特許文献１の技術を適用し、かしめ部の位置を避けて積層鉄心本体を平坦に押圧することは極めて困難であることを見出し、更に実験を繰り返し、より確実に樹脂漏れが防止できる積層鉄心の製造方法を完成した。
Conventionally, when there is a gap of a certain value or more between the mold for resin injection or the intermediate plate and the laminated core body, the possibility of resin leakage from the gap is extremely high, and disposal is performed. As a result, the yield of the laminated core body has been reduced.
The present inventor applies the technique of Patent Document 1 when the laminated core body is formed using the core pieces having undulations, and it is extremely difficult to press the laminated core body flat while avoiding the position of the caulking portion. We found it difficult, and repeated experiments to complete a method for manufacturing a laminated core that can prevent resin leakage more reliably.
本発明はかかる事情に鑑みてなされたもので、樹脂注入用金型又は中間プレートと積層鉄心本体との間に生じる隙間を樹脂漏れが発生する厚みより小さくして、樹脂滓が少なく、更に磁石挿入孔への樹脂未充填が生じ難い積層鉄心の製造方法を提供することを目的とする。 The present invention has been made in view of such circumstances, and the gap generated between the resin injection mold or intermediate plate and the laminated core body is made smaller than the thickness at which resin leakage occurs, the resin flaw is reduced, and the magnet An object of the present invention is to provide a method for manufacturing a laminated core in which resin is not filled in the insertion hole.
前記目的に沿う第１の発明に係る積層鉄心の製造方法は、１）それぞれ高低差が１０μｍ以下のうねりを有し、円周方向に複数のかしめ部が均等に又はグループ毎に均等に形成された複数枚の鉄心片をかしめ積層して形成され、２）中央には軸孔となる円形孔を有し、３）非加熱かつ非押圧状態で表面に高低差が１００〜１６０μｍのうねりを有し、４）前記円形孔の周囲にある複数の磁石挿入孔には永久磁石が挿入され、５）予熱された積層鉄心本体を、対向する樹脂注入用金型と受け金型とで挟持した状態で、前記樹脂注入用金型に設けられた樹脂溜め部から前記磁石挿入孔に樹脂を注入して前記永久磁石を固定する積層鉄心の製造方法であって、
前記積層鉄心本体の表面から前記かしめ部を、前記鉄心片の板厚の１０〜８０％の範囲で突出させ、
前記樹脂の注入の際、前記樹脂注入用金型の押圧平面を、前記積層鉄心本体の表面から突出する前記かしめ部に押し当てて加圧し、前記かしめ部が突出形成された前記積層鉄心本体の表面と前記押圧平面の隙間を５０μｍ未満とし、該隙間からの樹脂漏れを防止する。
The method for manufacturing a laminated core according to the first invention in accordance with the first object is as follows: 1) Each of the cores has a undulation of 10 μm or less, and a plurality of caulking portions are formed equally or circumferentially in the circumferential direction. 2) It has a circular hole as a shaft hole in the center, and 3) It has a undulation with a height difference of 100 to 160 μm on the surface in a non-heated and non-pressed state. 4) Permanent magnets are inserted into the plurality of magnet insertion holes around the circular hole , and 5) the preheated laminated core body is sandwiched between the opposing resin injection mold and the receiving mold. In the method for manufacturing a laminated iron core for fixing the permanent magnet by injecting resin into the magnet insertion hole from a resin reservoir provided in the resin injection mold,
The caulking portion is protruded from the surface of the laminated core body within a range of 10 to 80% of the thickness of the core piece,
During the injection of the resin, the pressing plane of the mold for injecting the resin is pressed against the caulking portion protruding from the surface of the laminated core main body to pressurize, and the laminated core main body in which the caulking portion protrudes is formed. The gap between the surface and the pressing plane is set to less than 50 μm to prevent resin leakage from the gap.
また、第２の発明に係る積層鉄心の製造方法は、１）それぞれ高低差が１０μｍ以下のうねりを有し、円周方向に複数のかしめ部が均等に又はグループ毎に均等に形成された複数枚の鉄心片をかしめ積層して形成され、２）中央には軸孔となる円形孔を有し、３）非加熱かつ非押圧状態で表面に高低差が１００〜１６０μｍのうねりを有し、４）前記円形孔の周囲にある複数の磁石挿入孔には永久磁石が挿入され、５）予熱された積層鉄心本体を、対向する樹脂注入用金型と受け金型とで挟持した状態で、前記樹脂注入用金型に設けられた樹脂溜め部から前記磁石挿入孔に樹脂を注入して前記永久磁石を固定する積層鉄心の製造方法であって、
前記積層鉄心本体の表面から前記かしめ部を、前記鉄心片の板厚の１０〜８０％の範囲で突出させ、
前記樹脂注入用金型と前記積層鉄心本体との間に前記樹脂溜め部から前記磁石挿入孔に前記樹脂を導くゲート孔を有する中間プレートを配置し、
前記樹脂の注入の際、該中間プレートの押圧平面を、前記かしめ部に押し当てて加圧し、前記積層鉄心本体の表面と前記押圧平面との隙間を５０μｍ未満とし、前記樹脂の注入時の該隙間からの樹脂漏れを防止する。
Moreover, the manufacturing method of the laminated iron core which concerns on 2nd invention is as follows. 1) Plurality which has a wave | undulation whose height difference is 10 micrometers or less, respectively, and several crimping parts were equally formed in the circumferential direction or every group It is formed by caulking and laminating pieces of iron core pieces, 2) having a circular hole serving as a shaft hole in the center, and 3) having a undulation with a height difference of 100 to 160 μm on the surface in an unheated and non-pressed state, 4) Permanent magnets are inserted into the plurality of magnet insertion holes around the circular hole , and 5) the preheated laminated core body is sandwiched between opposing resin injection mold and receiving mold, A method for manufacturing a laminated iron core for fixing a permanent magnet by injecting resin into the magnet insertion hole from a resin reservoir provided in the resin injection mold,
The caulking portion is protruded from the surface of the laminated core body within a range of 10 to 80% of the thickness of the core piece,
An intermediate plate having a gate hole for guiding the resin from the resin reservoir to the magnet insertion hole is disposed between the resin injection mold and the laminated core body,
When injecting the resin, the pressing plane of the intermediate plate is pressed against the caulking portion and pressed, and the gap between the surface of the laminated core body and the pressing plane is less than 50 μm. Prevents resin leakage from gaps.
第１の参考例に係る積層鉄心の製造方法は、円周方向に複数のかしめ部が形成された複数枚の鉄心片をかしめ積層して形成され、中央には円形孔を有し、その周囲にある複数の磁石挿入孔には永久磁石が挿入された積層鉄心本体を、対向する樹脂注入用金型と受け金型とで挟持した状態で、前記樹脂注入用金型に設けられた樹脂溜め部から前記磁石挿入孔に樹脂を注入して前記永久磁石を固定する積層鉄心の製造方法において、
前記樹脂の注入の際、前記樹脂注入用金型の押圧平面を前記積層鉄心本体の表面より突出する前記かしめ部に押し当てて加圧し、前記かしめ部が形成された前記積層鉄心本体の表面に前記押圧平面を押し付けて、前記積層鉄心本体の表面と前記押圧平面との隙間からの樹脂漏れを防止する。
The method of manufacturing a laminated core according to the first reference example is formed by caulking and laminating a plurality of core pieces each having a plurality of caulking portions formed in the circumferential direction, and has a circular hole in the center, A resin reservoir provided in the resin injection mold in a state where the laminated core body in which the permanent magnet is inserted is sandwiched between the opposed resin injection mold and the receiving mold. In the manufacturing method of the laminated core in which resin is injected from the portion into the magnet insertion hole and the permanent magnet is fixed,
When injecting the resin, the pressing plane of the resin injection mold is pressed against the caulking part protruding from the surface of the laminated core body, and is pressed to the surface of the laminated core body where the caulking part is formed. The pressing plane is pressed to prevent resin leakage from the gap between the surface of the laminated core body and the pressing plane.
第２の参考例に係る積層鉄心の製造方法は、円周方向に複数のかしめ部が形成された複数枚の鉄心片をかしめ積層して形成され、中央には円形孔を有し、その周囲にある複数の磁石挿入孔には永久磁石が挿入された積層鉄心本体を、対向する樹脂注入用金型と受け金型とで挟持した状態で、前記樹脂注入用金型に設けられた樹脂溜め部から前記磁石挿入孔に樹脂を注入して前記永久磁石を固定する積層鉄心の製造方法において、
前記樹脂注入用金型と前記積層鉄心本体との間に前記樹脂溜め部から前記磁石挿入孔に樹脂を導くゲート孔を有する中間プレートを配置し、前記樹脂の注入の際、該中間プレートを前記積層鉄心本体の表面より突出する前記かしめ部に押し当てて加圧し、前記かしめ部が形成された前記積層鉄心本体の表面を前記中間プレートの押圧平面に押し付けて、樹脂漏れを防止し、
前記樹脂を硬化させた後、前記中間プレートを樹脂封止された前記積層鉄心本体から取り除く。
The manufacturing method of the laminated core according to the second reference example is formed by caulking and laminating a plurality of core pieces each having a plurality of caulking portions formed in the circumferential direction, and has a circular hole in the center, A resin reservoir provided in the resin injection mold in a state where the laminated core body in which the permanent magnet is inserted is sandwiched between the opposed resin injection mold and the receiving mold. In the manufacturing method of the laminated core in which resin is injected from the portion into the magnet insertion hole and the permanent magnet is fixed,
An intermediate plate having a gate hole for guiding the resin from the resin reservoir to the magnet insertion hole is disposed between the resin injection mold and the laminated core body, and when the resin is injected, the intermediate plate is Pressing and pressing against the caulking portion protruding from the surface of the laminated core body, pressing the surface of the laminated core body formed with the caulking portion against the pressing plane of the intermediate plate to prevent resin leakage,
After the resin is hardened, the intermediate plate is removed from the resin-sealed laminated core body.
積層鉄心の製造方法において、前記積層鉄心本体は予熱されているのが好ましい。この場合、予熱の温度はより低いのがエネルギー的に好ましく、例えば、５０〜１５０度とするのがよい。 In the method for manufacturing a laminated core, the laminated core body is preferably preheated. In this case, it is preferable in terms of energy that the preheating temperature is lower, for example, 50 to 150 degrees.
なお、以上の発明又は参考例に係る積層鉄心の製造方法において、「うねり」とは非平面状態の総称をいい、具体的には、１枚の鉄心片を平板の上に置いた状態で、表面側の最低高さと最高高さの差が生じていることをいい、本発明では各鉄心片のうねり（表面の高低差）を原則１０μｍ以下としている。同一形状のうねりを有する鉄心片を重ねれば、積層鉄心本体においても、理論的にはうねりは１０μｍ以下となる。ところが、積層する鉄心片のうねり形状は異なるので、鉄心片を多数枚積層すると、積層鉄心本体の表面の高低差は１０μｍより遥かに大きくなる。 In addition, in the manufacturing method of the laminated core according to the above invention or the reference example , “swell” refers to a general term of a non-planar state, specifically, in a state where one piece of iron core is placed on a flat plate, It means that there is a difference between the minimum height and the maximum height on the surface side. In the present invention, the undulation (surface height difference) of each iron core piece is basically 10 μm or less. If iron core pieces having undulations of the same shape are stacked, the undulation is theoretically 10 μm or less even in the laminated core body. However, since the undulation shapes of the core pieces to be stacked are different, when a large number of core pieces are stacked, the height difference of the surface of the laminated core body becomes much larger than 10 μm.
ここで、樹脂注入用金型又は中間プレートに突出するかしめ部を逃がす収納部を設けた場合は、うねりを有する鉄心片を直に押圧して積層鉄心本体の表面に形成されるうねりを一定値以下（例えば、５０μｍ未満）にするには極めて大きな荷重が必要となることが実験により確認されている。
そこで、樹脂注入用金型又は中間プレートを平面にすると、突出するかしめ部を介して積層鉄心本体が押圧され、この場合、かしめ部を通じて押圧力が周囲に伝わり、比較的小さい荷重でも、積層鉄心本体の表面のうねり（即ち、凹凸差）を小さくすることができ、例えば、５０μｍ未満とすることができた。
各鉄心片のうねりを１０μｍ以下としたのは、各鉄心片のうねりが１０μｍを超えると、総合的な積層鉄心本体のうねりが大きくなり、樹脂注入用金型又は中間プレートの押圧力を常時使用している圧力より大きくする必要があり、操業上好ましくないからである。なお、このうねりの基準は、使用する金型装置の能力によって変えることができる。
Here, in the case of providing a housing portion for releasing the caulking portion protruding from the resin injection mold or intermediate plate, the undulation formed on the surface of the laminated core body by pressing the iron piece having the undulation directly is a constant value. It has been confirmed by experiments that an extremely large load is required for the following (for example, less than 50 μm).
Therefore, when the resin injection mold or the intermediate plate is made flat, the laminated core body is pressed through the protruding caulking portion. In this case, the pressing force is transmitted to the surroundings through the caulking portion, and the laminated iron core can be applied even with a relatively small load. The waviness (that is, the unevenness difference) of the surface of the main body can be reduced, for example, less than 50 μm.
The undulation of each core piece is set to 10 μm or less. When the undulation of each core piece exceeds 10 μm, the overall undulation of the laminated core body increases, and the pressing force of the resin injection mold or intermediate plate is always used. This is because it is necessary to make the pressure larger than the operating pressure, which is not preferable for operation. In addition, the reference | standard of this swell can be changed with the capability of the metal mold apparatus to be used.
第１、第２の発明に係る積層鉄心の製造方法においては、樹脂注入用金型又は中間プレートの押圧平面で、積層鉄心本体から突出したかしめ部を押圧するので、各鉄心片に多少のうねりがあっても、かしめ部を通じて伝わる荷重によって積層鉄心本体の表面のうねりが矯正され、樹脂注入用金型又は中間プレートの押圧平面と積層鉄心本体の表面との隙間が５０μｍ未満となって、樹脂封止時の樹脂漏れを無くすことができる。 In the manufacturing method of the laminated core according to the first and second inventions, the caulking portion protruding from the laminated core body is pressed by the pressing plane of the resin injection mold or the intermediate plate. Even if there is, the undulation of the surface of the laminated core body is corrected by the load transmitted through the caulking portion, and the gap between the pressing plane of the resin injection mold or intermediate plate and the surface of the laminated core body becomes less than 50 μm, and the resin Resin leakage during sealing can be eliminated.
続いて、添付した図面を参照しながら、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。 Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
本発明の第１の実施の形態に係る積層鉄心の製造方法について説明するにあたり、まず、図１、図２を参照しながら、樹脂封止を行う一般的な積層鉄心本体１０について説明する。積層鉄心本体１０は、厚みが例えば０．１５〜０．５ｍｍ程度で長尺の磁性鋼板からプレス金型によって、図２に示す形状の複数枚の鉄心片１１、１２を打ち抜き、かしめ積層して形成される。 In describing the method for manufacturing a laminated core according to the first embodiment of the present invention, first, a general laminated core body 10 that performs resin sealing will be described with reference to FIGS. 1 and 2. The laminated core body 10 is formed by punching and caulking and laminating a plurality of core pieces 11 and 12 having a shape shown in FIG. It is formed.
図２に示すように、各鉄心片１１には、最上部の鉄心片１２を除いてかしめ部１３が鉄心片１１の円周方向に均等角度で形成されている。最上部の鉄心片１２は下層の鉄心片１１に形成されたかしめ部１３に符合してかしめ貫通孔１５が形成されている。この実施の形態では、かしめ部１３はＶ型かしめが用いられ、かしめ貫通孔１５は平面視して長方形の抜き孔から構成されている。平面視して長方形のかしめ部はその長辺が円周方向を向いている。 As shown in FIG. 2, each core piece 11 is formed with caulking portions 13 at equal angles in the circumferential direction of the core piece 11 except for the uppermost core piece 12. The uppermost iron core piece 12 coincides with the caulking part 13 formed in the lower iron core piece 11, and a caulking through hole 15 is formed. In this embodiment, the caulking portion 13 uses a V-type caulking, and the caulking through-hole 15 is constituted by a rectangular hole in plan view. In the plan view, the long side of the rectangular caulking portion faces the circumferential direction.
これらの鉄心片１１、１２をかしめ積層して形成された積層鉄心本体１０は中央に円形孔の一例である軸孔１６を備え、その周囲には対となる磁石挿入孔１７、１８が複数組（この実施の形態では８組）均等角度で配置されている。
かしめ部１３は各鉄心片１１、１２の厚みより厚く（例えば、鉄心片の厚みの１．１又は１．２〜１．８倍）なって、最上部の鉄心片１２の上表面から突出し、かしめ部１３の頂部となるかしめ突起１９が形成される。
A laminated core body 10 formed by caulking and laminating these iron core pieces 11 and 12 is provided with a shaft hole 16 as an example of a circular hole at the center, and a plurality of pairs of magnet insertion holes 17 and 18 are set around the shaft hole 16. (Eight sets in this embodiment) They are arranged at an equal angle.
The caulking portion 13 is thicker than the thickness of each of the core pieces 11 and 12 (for example, 1.1 or 1.2 to 1.8 times the thickness of the core piece) and protrudes from the upper surface of the uppermost core piece 12; A caulking projection 19 that forms the top of the caulking portion 13 is formed.
図１に示すように、かしめ突起１９の位置は隣り合う組の磁石挿入孔１７、１８の中間位置の同一半径位置に円周方向に均等角度で配置されている。従って、かしめ突起１９は積層鉄心本体１０の最上部に軸対象に複数個形成されている。なお、図６に示すように、かしめ部１３ａの位置を一つ飛びの磁石挿入孔１７、１８の間で、円周方向に９０度位置に４つ形成してもよい。なお、かしめ部１３、１３ａは同一半径位置に設けられている。 As shown in FIG. 1, the positions of the caulking protrusions 19 are arranged at equal angles in the circumferential direction at the same radial position between the adjacent magnet insertion holes 17 and 18. Accordingly, a plurality of caulking protrusions 19 are formed on the uppermost part of the laminated core body 10 so as to be axial. As shown in FIG. 6, four caulking portions 13 a may be formed at 90 degrees in the circumferential direction between the one magnet insertion holes 17 and 18. The caulking portions 13 and 13a are provided at the same radial position.
従って、図１、図３にその一部を示すように、このような構造の積層鉄心本体１０を樹脂封止する場合は、各磁石挿入孔１７、１８に永久磁石２０（未磁化のものを含む）を入れて、必要な場合、図示しない搬送トレイ（特開２００８−１９９８９０号公報参照）に載せて、樹脂溜め部が設けられた樹脂注入用金型２３と受け金型２２との間に入れて、受け金型２２を上昇させて、積層鉄心本体１０を挟持して加圧する。樹脂注入用金型２３の押圧平面２４は完全平面となって、例えば、かしめ突起１９を収納する凹部は全く形成されていない。即ち、樹脂溜め部から磁石挿入孔１７、１８に樹脂を注入する際、押圧平面２４をかしめ突起１９に押し当てて加圧する。 Therefore, as shown in FIGS. 1 and 3, when the laminated core body 10 having such a structure is resin-sealed, permanent magnets 20 (unmagnetized ones) are placed in the magnet insertion holes 17 and 18. If necessary, it is placed on a transport tray (not shown) (see Japanese Patent Laid-Open No. 2008-199890) and placed between the resin injection mold 23 provided with a resin reservoir and the receiving mold 22. Then, the receiving mold 22 is raised, and the laminated core body 10 is sandwiched and pressurized. The pressing plane 24 of the resin injection mold 23 is a complete plane, and, for example, no recess for accommodating the caulking protrusion 19 is formed at all. That is, when the resin is injected from the resin reservoir into the magnet insertion holes 17 and 18, the pressing flat surface 24 is pressed against the caulking protrusion 19 to apply pressure.
図４（Ａ）、（Ｂ）には、対向する樹脂注入用金型２３と受け金型２２で押圧される積層鉄心本体１０のうねり２５の矯正状態を示している。仮に図４（Ａ）に示すように、下側に凹むようなうねり２５が積層鉄心本体１０に存在した場合、受け金型２２を上昇させると、積層鉄心本体１０の上部に形成されているかしめ突起１９に押圧平面２４が当接し、かしめ突起１９を押圧する。かしめ突起１９は各鉄心片１１に形成したかしめ部１３に連通し、かしめ部１３は各鉄心片１１に対して周方向均等角度位置に形成されて、各かしめ部１３の間に形成されているうねり２５に荷重は直接かかっていないので、かしめ部１３との高低差が減少し、平面化することができる。これによって、かしめ部１３（かしめ突起１９）が形成された表面を押圧平面２４に密着させて樹脂漏れを防止するようにしている。なお、ここで言う密着とは、かしめ突起１９と押圧平面２４が完全に当接したものに限らず、樹脂が漏れない程度の隙間（例えば、５０μｍ未満）を形成している場合も含まれる。 4A and 4B show a correction state of the undulation 25 of the laminated core body 10 pressed by the opposing resin injection mold 23 and the receiving mold 22. As shown in FIG. 4A, when the undulation 25 that is recessed downward is present in the laminated core body 10, the caulking formed on the upper part of the laminated core body 10 when the receiving mold 22 is raised. The pressing plane 24 comes into contact with the protrusion 19 and presses the caulking protrusion 19. The caulking protrusion 19 communicates with the caulking portion 13 formed on each iron core piece 11, and the caulking portion 13 is formed at an equal angular position in the circumferential direction with respect to each iron core piece 11 and is formed between the caulking portions 13. Since no load is directly applied to the undulations 25, the difference in height from the caulking portion 13 is reduced, and planarization can be achieved. Thus, the surface on which the caulking portion 13 (caulking protrusion 19) is formed is brought into close contact with the pressing plane 24 to prevent resin leakage. The close contact referred to here is not limited to the case where the caulking protrusion 19 and the pressing plane 24 are completely in contact with each other, and includes a case where a gap (for example, less than 50 μm) is formed so that the resin does not leak.
図４（Ｃ）は、樹脂注入用金型２７にかしめ突起１９が入る凹部２８を設けた場合を示しており、うねり部周辺に荷重が付加されるだけで高低差は残ったままの状態である。この鉄心片１１、１２を平面状態にするためには、極めて大きな荷重が必要であり、積層鉄心本体１０の面積も広く、樹脂注入用金型２７及び受け金型２２を支持する部材（例えば柱）の強度以上の荷重をかける必要があるが、これは不可能である。一方、本実施の形態においては、かしめ部１３を介して均等に積層鉄心本体１０に荷重をかけているので、各鉄心片１１、１２にかしめ部１３を介してより均等に荷重をかけて、より効果的にうねり２５を矯正し、積層鉄心本体１０の樹脂注入側表面に発生する隙間を小さくすることができる（以下の実施の形態においても同じ）。 FIG. 4C shows a case where a concave portion 28 into which the caulking protrusion 19 enters is provided in the resin injection mold 27, and a height difference remains with only a load applied around the waviness portion. is there. In order to make the core pieces 11 and 12 flat, a very large load is required, the area of the laminated core body 10 is large, and a member (for example, a column) that supports the resin injection mold 27 and the receiving mold 22 is used. However, this is not possible. On the other hand, in the present embodiment, since the load is applied evenly to the laminated core body 10 via the caulking portion 13, the load is applied evenly to the core pieces 11, 12 via the caulking portion 13, The waviness 25 can be corrected more effectively, and the gap generated on the resin injection side surface of the laminated core body 10 can be reduced (the same applies to the following embodiments).
図５（Ａ）には本発明の第２の実施の形態に係る積層鉄心の製造方法を示すが、樹脂注入用金型３０と積層鉄心本体１０との間に中間プレートの一例であるカルプレート（ダミープレートともいう）３１を配置して樹脂を注入する場合、かしめ突起１９が当接するカルプレート３１の押圧平面は完全平面となっている。これによって、積層鉄心本体１０を樹脂注入用金型３０と受け金型３２とで挟持押圧した場合、かしめ部１３に荷重が集中し、より効果的にうねりが除去され、カルプレート３１と積層鉄心本体１０との隙間が小さくなる（即ち、例えば５０μｍ未満の隙間になって密着する）。なお、カルプレート３１には磁石挿入孔１７、１８に樹脂を注入するゲート孔（樹脂注入孔）と必要な場合は樹脂注入用金型３０に形成されている樹脂溜めポット（樹脂溜め部の一例）とゲート孔を結ぶ溝状のランナーが設けられている。樹脂を硬化させた後、カルプレート３１は、樹脂封止された積層鉄心本体１０から取り除く。 FIG. 5 (A) shows a method for manufacturing a laminated core according to the second embodiment of the present invention, and a culplate which is an example of an intermediate plate between the resin injection mold 30 and the laminated core body 10. When the resin is injected by arranging 31 (also referred to as a dummy plate), the pressing plane of the cull plate 31 with which the caulking protrusion 19 abuts is a complete plane. As a result, when the laminated core body 10 is sandwiched and pressed between the resin injection mold 30 and the receiving mold 32, the load concentrates on the caulking portion 13 and the undulation is removed more effectively, and the calplate 31 and the laminated core are removed. The gap with the main body 10 becomes small (that is, the gap becomes less than 50 μm, for example, and is closely attached). The calplate 31 has a gate hole (resin injection hole) for injecting resin into the magnet insertion holes 17 and 18 and, if necessary, a resin reservoir pot (an example of a resin reservoir portion) formed in the resin injection mold 30. ) And a gate-shaped runner that connects the gate hole. After the resin is cured, the calplate 31 is removed from the resin-sealed laminated core body 10.
図５（Ｂ）には、本発明の第３の実施の形態に係る積層鉄心の製造方法を示すが、積層鉄心本体１０は、かしめ突起１９が下方に突出し、その下に搬送トレイ３４が配置されている場合で、搬送トレイ３４がかしめ突起１９に接する部分を平面としておく。樹脂を注入する樹脂溜めポット（樹脂溜め部の一例）を有する樹脂注入用金型３５はこの実施の形態では下型となって、受け金型３６は上型となっているが、樹脂注入用金型を上型、受け金型を下型として配置してもよい（以上の実施の形態においても同じ）。この例においては、搬送トレイ３４に磁石挿入孔１７、１８に樹脂を注入するゲート孔が設けられている。なお、以上の実施の形態に係る積層鉄心の製造方法において、一部の鉄心片のうねりを測定して、各鉄心片１１、１２のうねり（歪、厳密には表面の高低差）が３〜１０μｍの範囲にあったと推定される。 FIG. 5B shows a method for manufacturing a laminated core according to the third embodiment of the present invention. The laminated core body 10 has a caulking projection 19 projecting downward and a transport tray 34 disposed below it. In this case, a portion where the transport tray 34 is in contact with the caulking projection 19 is a flat surface. In this embodiment, the resin injection mold 35 having a resin reservoir pot (an example of a resin reservoir) for injecting resin is a lower mold, and the receiving mold 36 is an upper mold. The mold may be arranged as an upper mold and the receiving mold as a lower mold (the same applies to the above embodiments). In this example, the transport tray 34 is provided with a gate hole for injecting resin into the magnet insertion holes 17 and 18. In addition, in the manufacturing method of the laminated core according to the above embodiment, the undulations of some of the core pieces are measured, and the undulations (strains, strictly speaking, the height difference of the surface) of each of the core pieces 11 to 3 is 3 to 3. It is estimated that it was in the range of 10 μm.
図６に、４つのかしめ部１３ａが円周方向に均等配置された積層鉄心本体１１ａの上に感圧紙をおいて、当接面が平面となった中間プレートを介して樹脂注入用金型で押圧した状態を示す。積層鉄心本体１１ａの他方側は受け金型によって支持されている。感圧紙は荷重を受けた部分が黒くなっているが、磁石挿入孔の周囲とかしめ部１３ａの周りが加圧されていることが判る。この実験例では樹脂漏れは発生しなかった。 In FIG. 6, a pressure-sensitive paper is placed on a laminated core body 11a in which four caulking portions 13a are evenly arranged in the circumferential direction, and a resin injection mold is inserted through an intermediate plate having a flat contact surface. The pressed state is shown. The other side of the laminated core body 11a is supported by a receiving mold. The pressure-sensitive paper is black at the portion receiving the load, but it can be seen that the periphery of the magnet insertion hole and the periphery of the caulking portion 13a are pressurized. In this experimental example, no resin leakage occurred.
図７には、かしめ突起（ダボ）を平押し（即ち、平面で押す）した場合と、かしめ突起を逃がす凹部（ダボ逃がし）を形成した場合の、樹脂漏れ状態を調査したグラフであり、樹脂漏れの閾値は、樹脂に混入されているフィラーとの関係で０．０５ｍｍとしている。即ち、積層鉄心本体１０の表面に、０．０５ｍｍ以上の隙間があると樹脂漏れが発生し、０．０５ｍｍ未満であると樹脂漏れが生じないことを意味している。 FIG. 7 is a graph showing the resin leakage state when the caulking protrusion (dowel) is pressed flat (that is, pressed with a flat surface) and when the concave portion (dowel relief) for releasing the caulking protrusion is formed. The leakage threshold is set to 0.05 mm in relation to the filler mixed in the resin. That is, if there is a gap of 0.05 mm or more on the surface of the laminated core body 10, resin leakage occurs, and if it is less than 0.05 mm, it means that resin leakage does not occur.
ダボ逃がしを用いると、コア（積層鉄心本体）１の場合も、樹脂注入用金型と受け金型とで押圧したコア２の場合も、その隙間を０．１５ｍｍ未満とすることができず、樹脂漏れ閾値を上回っているため、隙間から樹脂漏れが発生する。なお、ダボ逃がしの場合、コア１、コア２を加熱してもその隙間に変化は無かった。
一方、平押しダボ抑えで、コア１の場合は樹脂注入用金型と受け金型とで押圧すると隙間が０．０５ｍｍ未満となる。また、コア２の場合は、単に押圧しただけでは、隙間が樹脂漏れ閾値を上回っているが、１００℃に加熱した時点で又は１００℃を超えた時点で、隙間が０．０５ｍｍ未満になり、隙間が閾値を下回ることから樹脂漏れは起こさない。通常の積層鉄心本体１０は熱硬化性樹脂を注入するので、予熱も行っており、仮に０．１５ｍｍ程度の隙間があっても、かしめ突起に平面荷重をかけることで、樹脂漏れを防止できる。
なお、図７に使用した鉄心片のうねりは非加熱状態で３〜１０μｍの範囲にあった。積層鉄心本体自体の表面のうねりは、非加熱かつ非押圧状態で１００〜１６０μｍ程度であるのが確認されていた。
When the dowel relief is used, the gap cannot be less than 0.15 mm in both the core (laminated core body) 1 and the core 2 pressed by the resin injection mold and the receiving mold. Since the resin leakage threshold is exceeded, resin leakage occurs from the gap. In the case of dowel relief, there was no change in the gap even when the core 1 and the core 2 were heated.
On the other hand, in the case of the core 1 with flat pressing dowel suppression, when the resin injection mold and the receiving mold are pressed, the gap becomes less than 0.05 mm. Further, in the case of the core 2, the gap exceeds the resin leakage threshold only by pressing, but when heated to 100 ° C. or exceeds 100 ° C., the gap becomes less than 0.05 mm, Since the gap is below the threshold value, no resin leakage occurs. Since the normal laminated core body 10 is injected with a thermosetting resin, preheating is also performed. Even if there is a gap of about 0.15 mm, a resin load can be prevented by applying a planar load to the caulking protrusion.
In addition, the undulation of the core piece used in FIG. 7 was in the range of 3 to 10 μm in an unheated state. It has been confirmed that the surface undulation of the laminated core body itself is about 100 to 160 μm in a non-heated and non-pressed state.
従って、以上のことから、かしめ突起を押圧面が平面となった樹脂注入用金型で押圧すると、かしめ部を伝って荷重が伝達し 積層鉄心本体の表面と樹脂注入用金型の隙間が小さくなり、樹脂漏れを起こさないことが判る。また、積層鉄心本体を加熱すると、更にうねりに伴う変形が減少し、隙間が殆ど無くなり樹脂漏れが生じない。 Therefore, when the caulking protrusion is pressed with a resin injection mold having a flat pressing surface, the load is transmitted through the caulking portion, and the gap between the surface of the laminated core body and the resin injection mold is small. It can be seen that no resin leakage occurs. Moreover, when the laminated core body is heated, deformation due to waviness is further reduced, gaps are almost eliminated, and resin leakage does not occur.
本発明は前記した実施の形態に限定されるものではなく、本発明の要旨を変更しない範囲でその構成を変更することもできる。
例えば、かしめ部はＶ字かしめでなく、半抜きかしめであってもよい。また、前記実施の形態においては、回転子積層鉄心（ロータコア）の製造に本発明を適用した例を示すが、固定子積層鉄心（ステータコア）であってもよい。
また、複数のかしめ部は鉄心片に対して同一半径位置に軸対称に設けられているのが好ましいが、本発明においては必須の要件ではない。
前記実施の形態においては、かしめ部は各鉄心片に対して円周方向に均等に配置されていたが、グループ毎に円周方向に均等に配置されている場合でも本発明は適用される。
The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention.
For example, the caulking portion may not be V-shaped caulking but may be half-cut caulking. Moreover, in the said embodiment, although the example which applied this invention to manufacture of a rotor lamination | stacking iron core (rotor core) is shown, a stator lamination | stacking iron core (stator core) may be sufficient.
Further, the plurality of caulking portions are preferably provided axially symmetrically at the same radial position with respect to the iron core piece, but this is not an essential requirement in the present invention.
In the above-described embodiment, the caulking portions are uniformly arranged in the circumferential direction with respect to each iron core piece. However, the present invention is applied even when the caulking portions are equally arranged in the circumferential direction for each group.
１０：積層鉄心本体、１１、１２：鉄心片、１１ａ：積層鉄心本体、１３、１３ａ：かしめ部、１５：かしめ貫通孔、１６：軸孔、１７、１８：磁石挿入孔、１９：かしめ突起、２０：永久磁石、２２：受け金型、２３：樹脂注入用金型、２４：押圧平面、２５：うねり、２７：樹脂注入用金型、２８：凹部、３０：樹脂注入用金型、３１：カルプレート、３２：受け金型、３４：搬送トレイ、３５：樹脂注入用金型、３６：受け金型 10: Laminated core body, 11, 12: Iron core piece, 11a: Laminated core body, 13, 13a: Caulking portion, 15: Caulking through hole, 16: Shaft hole, 17, 18: Magnet insertion hole, 19: Caulking protrusion, 20: permanent magnet, 22: receiving mold, 23: resin injection mold, 24: pressing plane, 25: undulation, 27: resin injection mold, 28: recess, 30: resin injection mold, 31: Cull plate, 32: receiving mold, 34: transfer tray, 35: mold for resin injection, 36: receiving mold
Claims (2)
前記積層鉄心本体の表面から前記かしめ部を、前記鉄心片の板厚の１０〜８０％の範囲で突出させ、
前記樹脂の注入の際、前記樹脂注入用金型の押圧平面を、前記積層鉄心本体の表面から突出する前記かしめ部に押し当てて加圧し、前記かしめ部が突出形成された前記積層鉄心本体の表面と前記押圧平面の隙間を５０μｍ未満とし、該隙間からの樹脂漏れを防止することを特徴とする積層鉄心の製造方法。 1) Each is formed by caulking and laminating a plurality of core pieces each having a undulation with a height difference of 10 μm or less, and a plurality of caulking portions formed uniformly in the circumferential direction or in each group, 2) center Has a circular hole to be a shaft hole , 3) has a undulation with a height difference of 100 to 160 μm in a non-heated and non-pressed state, and 4) a plurality of magnet insertion holes around the circular hole. Is inserted from the resin reservoir provided in the resin injection mold in a state where the preheated laminated core body is sandwiched between the opposed resin injection mold and the receiving mold. a method of manufacturing a laminated core by injecting resin into the magnet insertion hole for fixing the permanent magnet,
The caulking portion is protruded from the surface of the laminated core body within a range of 10 to 80% of the thickness of the core piece,
During the injection of the resin, the pressing plane of the mold for injecting the resin is pressed against the caulking portion protruding from the surface of the laminated core main body to pressurize, and the laminated core main body in which the caulking portion protrudes is formed. A method for producing a laminated iron core, characterized in that a gap between the surface and the pressing plane is less than 50 μm, and resin leakage from the gap is prevented.
前記積層鉄心本体の表面から前記かしめ部を、前記鉄心片の板厚の１０〜８０％の範囲で突出させ、
前記樹脂注入用金型と前記積層鉄心本体との間に前記樹脂溜め部から前記磁石挿入孔に前記樹脂を導くゲート孔を有する中間プレートを配置し、
前記樹脂の注入の際、該中間プレートの押圧平面を、前記かしめ部に押し当てて加圧し、前記積層鉄心本体の表面と前記押圧平面との隙間を５０μｍ未満とし、前記樹脂の注入時の該隙間からの樹脂漏れを防止することを特徴とする積層鉄心の製造方法。 1) Each is formed by caulking and laminating a plurality of core pieces each having a undulation with a height difference of 10 μm or less, and a plurality of caulking portions formed uniformly in the circumferential direction or in each group, 2) center Has a circular hole to be a shaft hole , 3) has a undulation with a height difference of 100 to 160 μm in a non-heated and non-pressed state, and 4) a plurality of magnet insertion holes around the circular hole. Is inserted from the resin reservoir provided in the resin injection mold in a state where the preheated laminated core body is sandwiched between the opposed resin injection mold and the receiving mold. a method of manufacturing a laminated core by injecting resin into the magnet insertion hole for fixing the permanent magnet,
The caulking portion is protruded from the surface of the laminated core body within a range of 10 to 80% of the thickness of the core piece,
An intermediate plate having a gate hole for guiding the resin from the resin reservoir to the magnet insertion hole is disposed between the resin injection mold and the laminated core body,
When injecting the resin, the pressing plane of the intermediate plate is pressed against the caulking portion and pressed, and the gap between the surface of the laminated core body and the pressing plane is less than 50 μm. A method for producing a laminated core, characterized by preventing resin leakage from a gap.
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- 2013-08-02 JP JP2013161703A patent/JP5451934B1/en active Active
- 2013-11-05 CN CN201310540651.5A patent/CN103812285B/en active Active
- 2013-11-05 US US14/072,241 patent/US9564790B2/en active Active
- 2013-12-24 JP JP2013265673A patent/JP6138673B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| US20140124980A1 (en) | 2014-05-08 |
| US9564790B2 (en) | 2017-02-07 |
| JP2014113041A (en) | 2014-06-19 |
| JP6138673B2 (en) | 2017-05-31 |
| CN103812285B (en) | 2017-01-18 |
| JP2014113027A (en) | 2014-06-19 |
| CN103812285A (en) | 2014-05-21 |
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